The invention discloses a monolayer two-way stretch light reflection polypropylene film, which is characterized by being manufactured by mixing, extruding, two-way stretching and forming of 30 parts of first component, 60-80 parts of second component and 1-5 parts of third component by mass, wherein the first component comprises 3-48 parts of inorganic particle and 5-50 parts of A resin by mass which are mixed; the second component comprises 50-70 parts of polypropylene resin and 1-20 parts of compatilizer by mass which are mixed; and the third component comprises 0.05-1 part of organic ultraviolet absorbent and 0.5-5 parts of antistat by mass which are mixed. The monolayer two-way stretch light reflection polypropylene film is manufactured by the steps of extruding by an extruder at first, longitudinally stretching, horizontally stretching, thermoforming and forming in a drying tunnel, and can be used for manufacturing light reflection film members with flexibility requirements.